Wurth Elektronik Digital Days

The input bridge rectifier found in almost all AC-DC power supplies generates losses that present a challenge in achieving the highest possible efficiency. However, removing the diode bridge, PFC FET and boost diode in favor of a totem pole PFC solution enhances efficiency using active switches. The control of such circuits is complex. Often, a microcontroller is needed and associated code which presents a barrier to adoption for design teams where time is limited. onsemi NCP1680 mixed signal PFC controller is discussed in the article as it provides a code-less solution for totem-pole PFC.